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59
ELECTRICAL
House Battery Bank
The House Battery Bank is necessary to operate
everything a customer may require in order to live in the
unit. These batteries can be either 6 Volt deep cycle (all
diesel coaches) or 12 Volt deep cycle, depending on the
model and brand of the coach. Newmar house batteries
may be serviceable or sealed.
If a battery is discharged to 50 percent every day, it will
last about twice as long as if it is cycled to 80 percent
DOD. If cycled only 10 percent DOD, it will last about five
times as long as one cycled to 50 percent. The most
practical number to use is 50 percent DOD on a regular
basis for the best use of effective storage and cost.
Note: Both voltage and specific gravity tests should be
performed with no load on the batteries and without any
supplied charging. Turn off all draws and charging. Allow
the batteries to stabilize, and then proceed with the test.
Battery State/Voltage Chart
State of Charge Specific Gravity
12 Volt
6 Volt
100%
1.265
12.7
6.3
75%
1.225
12.4
6.2
50%
1.190
12.2
6.1
25%
1.155
12.0
6.0
Discharged
1.120
11.9
6.0
House and Chassis Battery Bank Overview
House Battery Bank Example
Chassis Battery Bank Example
Do not use the motorhome with the coach batteries
disconnected.
CAUTION
!
This battery state voltage chart is used as an
example. Your specific battery manufacturer’s chart
may vary.
IMPORTANT
!
In addition, there is an upper limit. A battery that is
continually cycled down five percent or less will usually
not last as long as one cycled down 10 percent. At very
shallow cycles, lead dioxide tends to build up in clumps
on the positive plates rather than in an even layer.
This article provides a brief overview of the two different
battery banks in a Newmar coach: House and Chassis.
Chassis Battery Bank
The Chassis Battery Bank supplies power to everything a
customer requires to drive the unit. Currently, Newmar’s
chassis batteries are all Liquid Lead Acid. Spartan and
Ford chassis have serviceable batteries and Freightliner
chassis batteries are sealed. The type and brand of
chassis battery may vary depending on coach year,
make, and model. Chassis batteries may need to be
disconnected and removed from the coach to maintain
proper electrolyte levels or perform routine battery
maintenance. House batteries may be either serviceable
Liquid Lead Acid/Flooded or AGM/Sealed Cell.
The chassis batteries on your motorhome are installed
and warranted by the chassis manufacturer. The coach
(or house) batteries on your motorhome are installed
by Newmar Corporation, but warranted by the battery
manufacturer. These batteries are used to operate the
12 volt items that are not a direct part of the chassis.
Depending on the coach, the batteries may be located in
the front of the coach under the front cap or on a pull out
tray in an outside compartment.
The chassis batteries are recharged by the vehicle’s
electrical system whenever the engine is running,
with added BIRD, BIM, or Charge bridge solenoids the
vehicle’s charging system will also charge house batteries
if parameters are met. A decline in the coach battery
voltage may be noticed while the chassis batteries are
being charged.
The converter will automatically charge the coach
batteries when the unit is connected to a 120 volt outside
power source. The chassis batteries are isolated from the
coach batteries, however with certain parameters met
the BIRD, BIM, or Charge bridge will activate and allow
charge to the chassis battery also. This prevents the
chassis batteries from being drained by the interior 12 volt
equipment, allowing ample voltage for engine ignition.
Summary of Contents for Bay Star 2022
Page 1: ...SM 2022...
